If you’d been born 1,500 years ago in southern Europe, you’d have been convinced that the Roman empire would last forever. It had, after all, been around for 1,000 years. And yet, following a period of economic and military decline, it fell apart. By 476 CE it was gone. To the people living under the mighty empire, these events must have been unthinkable. Just as they must have been for those living through the collapse of the Pharaoh’s rule or Christendom or the Ancien Régime.

We are just as deluded that our model of living in ‘countries’ is inevitable and eternal. Yes, there are dictatorships and democracies, but the whole world is made up of nation-states. This means a blend of ‘nation’ (people with common attributes and characteristics) and ‘state’ (an organised political system with sovereignty over a defined space, with borders agreed by other nation-states). Try to imagine a world without countries – you can’t. Our sense of who we are, our loyalties, our rights and obligations, are bound up in them.

Which is all rather odd, since they’re not really that old. Until the mid-19th century, most of the world was a sprawl of empires, unclaimed land, city-states and principalities, which travellers crossed without checks or passports. As industrialisation made societies more complex, large centralised bureaucracies grew up to manage them. Those governments best able to unify their regions, store records, and coordinate action (especially war) grew more powerful vis-à-vis their neighbours. Revolutions – especially in the United States (1776) and France (1789) – helped to create the idea of a commonly defined ‘national interest’, while improved communications unified language, culture and identity. Imperialistic expansion spread the nation-state model worldwide, and by the middle of the 20th century it was the only game in town. There are now 193 nation-states ruling the world.

But the nation-state with its borders, centralised governments, common people and sovereign authority is increasingly out of step with the world. And as Karl Marx observed, if you change the dominant mode of production that underpins a society, the social and political structure will change too.